drm/i915: Convert the register access tracepoint to be conditional

The TRACE_EVENT_CONDITION is supposed to generate more efficient code
than if (cond) trace(), which is what we are currently using inside the
register access functions.

v2: Rebase onto uncore

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

3 files changed, 8 insertions, 6 deletions

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 0e904986f3e9..ed72fe08217c 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1004,7 +1004,7 @@ static int gen6_drpc_info(struct seq_file *m)
         }
 
         gt_core_status = readl(dev_priv->regs + GEN6_GT_CORE_STATUS);
-        trace_i915_reg_rw(false, GEN6_GT_CORE_STATUS, gt_core_status, 4);
+        trace_i915_reg_rw(false, GEN6_GT_CORE_STATUS, gt_core_status, 4, true);
 
         rpmodectl1 = I915_READ(GEN6_RP_CONTROL);
         rcctl1 = I915_READ(GEN6_RC_CONTROL);
diff --git a/drivers/gpu/drm/i915/i915_trace.h b/drivers/gpu/drm/i915/i915_trace.h
index 7d283b5fcbf9..2933e2ffeaa4 100644
--- a/drivers/gpu/drm/i915/i915_trace.h
+++ b/drivers/gpu/drm/i915/i915_trace.h
@@ -406,10 +406,12 @@ TRACE_EVENT(i915_flip_complete,
             TP_printk("plane=%d, obj=%p", __entry->plane, __entry->obj)
 );
 
-TRACE_EVENT(i915_reg_rw,
-        TP_PROTO(bool write, u32 reg, u64 val, int len),
+TRACE_EVENT_CONDITION(i915_reg_rw,
+        TP_PROTO(bool write, u32 reg, u64 val, int len, bool trace),
 
-        TP_ARGS(write, reg, val, len),
+        TP_ARGS(write, reg, val, len, trace),
+
+        TP_CONDITION(trace),
 
         TP_STRUCT__entry(
                 __field(u64, val)
diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index 89bb9da377fc..8f5bc869c023 100644
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -359,7 +359,7 @@ u##x i915_read##x(struct drm_i915_private *dev_priv, u32 reg, bool trace) { \
                 val = __raw_i915_read##x(dev_priv, reg); \
         } \
         spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags); \
-        if (trace) trace_i915_reg_rw(false, reg, val, sizeof(val)); \
+        trace_i915_reg_rw(false, reg, val, sizeof(val), trace); \
         return val; \
 }
 
@@ -373,7 +373,7 @@ __i915_read(64)
 void i915_write##x(struct drm_i915_private *dev_priv, u32 reg, u##x val, bool trace) { \
         unsigned long irqflags; \
         u32 __fifo_ret = 0; \
-        if (trace) trace_i915_reg_rw(true, reg, val, sizeof(val)); \
+        trace_i915_reg_rw(true, reg, val, sizeof(val), trace); \
         spin_lock_irqsave(&dev_priv->uncore.lock, irqflags); \
         if (NEEDS_FORCE_WAKE((dev_priv), (reg))) { \
                 __fifo_ret = __gen6_gt_wait_for_fifo(dev_priv); \